package com.day15.exer3;
/*
定义一个Circle类，声明radius属性，通过getter和setter方法
 */
public class Circle {
    private Double radius;

    public Double getRadius(){
        return radius;
    }
    public void setRadius(Double radius){
        this.radius = radius;
    }

    public Circle(){}
    public Circle(Double radius){
        this.radius = radius;
    }
}
